While there is a substantial amount of research investigating bullying in schools, research on bullying and peer violence in secure settings (e.g. prisons, secure care homes, or forensic psychiatric facilities) is rather limited. Living in secure settings of any kind, however, implies operating in a more or less inescapable social system. The unique nature of the 'institutional' social context, together with individual characteristics of its residents, makes bullying and/or peer violence in institutions arguably more complex than school bullying and worth separate investigation and preventative strategies.This e-book of JACPR aims to advance our understanding of bullying and peer violence amongst those detained in secure settings and suggest specific policy implications to address this type of bullying. The chapters are presented in two clusters, each comprised of three chapters. The first group focuses on bullying and peer violence amongst young people in residential care, while the second centres on bullying occurring in juvenile and adult prisons.